[Matrixbeast]

Oh, hey. Akaishi is gonna get a monster form. Neat.

Anyway, I can actually see why Daiji is being the way he is. He's not his brother, who meddles in things he doesn't understand and gets rewarded, nor his sister, in which reality itself warps around. He's a realist who did everything in his power to save those around him, and still failed.

Mentally broken, he's taking the path of least resistance. He knows Akaishi is playing him. He knows Giff is evil. He just wants to save as many lives as possible. Conversely, Ikki and Sakura wants to give humanity a choice rather than live under oppression. However, that means lives will be lost, as demonstrated in this episode.

The key issue isn't about whether or not Ikki can beat Giff. It's about how many lives will Giff, Akaishi, and Vail can (And will) take before he can accomplish that.
(Unfortunately, the series does seem to imply that Daiji doesn't have faith in Ikki's ability to win, but still, this point does stand)

Anyway, despite building up to the climax, Revice is definitely dragging it's heels.